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Experimental and Numerical Investigation on a Fully Developed Turbulent Pipe Flow over a Semicircle Orifice

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2590
pages 2504-2512

S. Okuda
Department of Mechanical Engineering, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

C.-H. Lepeut
Department of Mechanical Engineering, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

M. Rasti
Department of Mechanical Engineering, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

Takuya Kawata
Graduate School of Science and Technology, Keio University, 3-14-1, Kohoku-ku, Hiyoshi, 223-8522 Yokohama, Japan; Department of Mechanical Engineering, Tokyo University of Science Yamazaki 2641 Noda, Chiba 278-8510, Japan

Shinnosuke Obi
Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

Sinopsis

The internal separated flow associated with remarkable mean secondary flow is investigated both experimentally and computationally. The computational investigation indicates that the commercially available RANS model group and LES provide obvious difference in terms of the prediction of the flow reattachment and recovery. On the other hand, some over-proportional magnitude of the velocity fluctuation across the mean flow direction is found by velocity measurement by stereo PIV. The recirculation region in either side of the orifice seems to be the source of the streamwise vortex that governs the development of the flow near the flow reattachment point. The considered flow serves as a useful test case for both RANS modeling and LES.

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